System Administration

Telnet Email Address Validation (Existence)

Whether it’s reconnaissance or some useful email address validation pre-processing, it might be handy to know a few things about telnet email address validation. This subject is tightly related to OpenRelay hunt/abuse, email Spoofing, spam and other nice things, but that’s not what we’re after. Our goal here is to find a passive way to check if there is a specific email address on a mail server.Read More »Telnet Email Address Validation (Existence)

DMARC Email Validation System

Domain-based Message Authentication, Reporting, and Conformance (DMARC) is a standard that helps protect email senders and recipients from spoofing, spam and phishing. With this, mail server owners can define a policy related to email authentication practices, which receiving email servers can then use as an instruction set on how to enforce it.Read More »DMARC Email Validation System

DKIM Email Security Standard

DKIM email security standard was designed to make sure messages were not altered or compromised in transit between sender and receiver. It uses public-key cryptography to sign email with private key before it’s sent from server. Recipient server can then use public key published on domain’s DNS to verify the source of the message, and that the body of the message hasn’t changed. Once hash is verified, message passes DKIM check and is considered authentic.Read More »DKIM Email Security Standard

Dante SOCKS5 Proxy Server Setup

Dante Socks Proxy Server is developed by Inferno Nettverk A/S, and it consists of a SOCKS server and a SOCKS client, implementing RFC 1928 and other related standards. Usefull server when you need a quick proxy setup, unfortunatelly, it’s relatively limited when it comes to customization. If you want more control, you’ll need to purchase additional modules for e.g. Bandwidth control, LDAP, Redirect, etc.Read More »Dante SOCKS5 Proxy Server Setup